Power transmission.



A. W. TUFFORD.

POWER TRANSMISSION.

APPLIGATION FILED JAN. 21, 1914.

Patented Dea 15, 1914.

3 SHEETS-SHEET 1.

W I TNlfSSES A TTORNE Y nununl Dtrrfls co PHOTO-LITHCI WASHINGTON, D. r

A. W. TUFFORD.

POWER TRANSMISSION.

APPLICATION FILED JAN. 27, 1914.

1,120,867, Patented Dec. 15, 1914.

3 SHEETS-SHEET 2.

WITNESSES 1H5 NORRIS PETERS cc PHOTO'LITHO WASHINLTON. D

A. W. TUPFORD. POWER TRANSMISSION. nrmcuxon FILED JAN. 27, 1914.

Patented D60. 15, 1914.

s SHEETBSHEET 3.

ATTORNEY.

WITNESSES:

THE NORRIS PETERS c0.PHoTo4 |1 'Ho,. WASHINGTON, D cv UNITE STAT? ANDREWWALLIS TUFFORD, 0F TORONTO, ONTARIO, CANADA.

POWER TRANSMISSION.

1,12oso7.

Application filed January 2 To all whom it may concern lie it known thatI, AQJDREW WALLIS T UF- ron'o, a subject of the King of Great Britain.residing at Toronto. in the Province of Ontario, Dominion of Canada,have invented new and useful Improvements in Power flransmission. ofwhich the following is a specification.

My invention relates to a transmiss on system for power boats and has asits principal object the provision of a transmission adapted for usebetween the motor and the propeller, or propellers of a power boat whichshall enable the motor to be run at a high rate of speed and, at thesame time, obtain a maximum etliciency from the prop ell ers.

A further object of my invention is to provide transmission whereby twopropellers may be driven on the same shaft in opposite directions by thesame engine.

A third object of my invention is to provide a plurality of shaftsdriven by the same engine, and means whereby a pair of propellers oneach shaft may be driven in opposite direct ons by the same engine.

A final object of my i vcntion resides in the particular a angement andcombination of parts hereinafter described.

In the accompanying drawings :Figure 1 is a side elevation of the main diving gear case. Fig. is a plan view of the device shown in Fig. 1. thetop half of the case and the intermediate gears being remo ed. Fig. 3 isa cross section on the line A.'- i of Fig. 1. Fig. 4 is a detail View.partly in section. of what I call a No. 2 propeller. Fig. is a sideelevation of the bevel gear case. Fig. 6 is a plan view of the caseshown in Fig. 5 with its cover removed. F 7 is a cross section on theline B ll of Fig. Fig. 8 is a detail view, partly in section. showingwhat I call a No. 1 propeller. Fig. 9 is a side elevation of a boathowing the general arrangement of the motor, propellers and powertransmission mechanism. arranged according to my invention. Fig. 10 isan end view of the boat shown in Fig. 9.

'lhroughont the separate views the same part is designated by the samereference character.

Referring more particularly to the drawings. 1 is a casing for the maindriving gear which split along a central horizontal line as clearlyshown in Fig. 1 and which Specification of Letters Patent.

Patented Dec. 15, 1914.

7, 1914. Serial No. 81.4 689.

is held together by bolts 2 fastening through the flanges Mounted in thecasing 1 are three shafts 10, 11 and 12 which are mounted in journals10, 11 and 12, respectively, formed half in the base and half in the topof the casing 1. In the top part of the casing 1 I have journaled alsotwo shafts S on which are loosely mounted gears 4 and The gears 4 and 5are always in mesh with gears 6 and 7, respectively, which are looselymounted on the shafts 10 and 12. respectively, each of the gears 6 and 7being provided with a pair of flanges 1l 14; by which the gears 4 and 5are constrained to move or slide along their respective shafts when thegears (3 and 7 are shifted. In order that the gears 6 and 7 may beshifted they are each provided with collar 6 provided with a groove Apin 36 is carried by a strap 37 and projects into the groove and thestrap 87 is mounted at the end of the lever 16 which projects throughthe top of th casing as clearly shown in Fig. and is pivoted at point 17on the lug 18.

The central shaft 11 is extended through the casing l in both directionsand the end marked 13 in Fig. 2, is connected to the eng ne as indicatedin Fig. 9. The shaft 11 also carries a fixed gear 3 and it will beunderstood that when the gears G and 7 are in the position shown in fulllines in Fig. 2, that the small gears fl and are then in mesh with thecentral gear 3, and the gears 6 and 7 are con equently driven from thecentral shaft. However, when the gears G and 7 are shifted into thedotted position shown in Fig. 2 and indicated by the reference nu moral15, the gears L and are then out of mesh with the central gear 3 andshafts 10 and 12 not turned.

The shafts 10. 11 and 1) extend from the lasing 1 toward the stern ofthe boat and adjacent the casing 1 is a second casing 21 also made intwo halves in a manner similar to that already described in connectionwith casing 1, and held together by means of bolts such as 26. Theflanges on the two halves of the casing 91 furnish bearings for theshafts 10, 11 and 12, all of which extend entirely through the casing21. Both halves of the casing 21 are provided with interiorly projectinglugs such as 24 to which are bolted two similar strips or bars of metalindicated by reference characters 22 and each of the bars 22 hasjournaled thereon three bevel gears such as 25. The bevel gears 25 meshwith bevel gears 27 which are fixed on the shafts 10, 11 and 12 and aredriven thereby. The bevel gears 25 also mesh with a second set of gears28, the axes of which are in alinement with the shafts 10, 11 and 12 butwhich are fastened to sleeves 29 one of which surrounds each of theshafts 10, 11 and 12. Consequently, the sleeves 29 are driven from theshafts 10, 11 and 12 but in opposite directions by means of the gears27, pinions 25 and gears 28. From the casing 21, the shafts 10, 11 and12, as well as the corresponding sleeves 29, extend through the rear ofthe boat or vessel, and, as clearly shown in Fig. 9, the shafts 10, 11and 12 extend beyond the end of the corresponding sleeves and each oneof said shafts is fitted with a propeller Which I have designated as No.2 propeller. Each of the sleeves 29 is also provided with a propellerwhich I have designated as No. 1 propeller. Consequently it will be seenthat the propellers Nos. 1 and 2 revolve in opposite directions which ishighly to be desired in case the motors are high speed machines.

It will be understood that while I have shown and described thepreferred form of my invention, that I do not wish to be limited theretobut contemplate all such modifications and variations thereof as aremechanically equivalent of the apparatus shown and described herein.

Having thus described my invention what I claim is 1. In a power boat incombination, a motor, a shaft for said motor prolonged to serve as apropeller shaft, a plurality of propeller shafts in addition to themotor shaft, propeller driving sleeves mounted on and surrounding saidpropeller shafts, and means for driving said additional shafts and saidsleeves from said motor comprising beveled gears mounted one on each ofsaid propeller shafts, beveled gears alined with said first mentionedbeveled gears and mounted one on each of said propeller sleeves, pinionsmeshing with both of said beveled gears, and gearing connections between said motor shaft and said additional shafts, said gearing beingcapable of being disconnected at will.

In a power boat in combination, a motor, a shaft for said motorprolonged to serve as a propeller shaft, a plurality of propeller shaftsin addition to the motor shaft, propeller driving sleeves mounted on andsurrounding said propeller shafts, and means for driving said additionalshafts and said sleeves from said motor comprising beveled gears mountedone on each of said propeller shafts, beveled gears alined with saidfirst mentioned beveled gears and mounted one on each of said propellersleeves, pinions meshing with both of said beveled gears, and gearingconnections between said motor shaft and said additional shafts, saidgearing being arranged to disconnect any of said additional shafts asdesired.

3. In a power boat in combination, a motor, a shaft for said motorprolonged to serve as a propeller shaft, a plurality of propeller shaftsin addition to the motor shaft, propeller driving sleeves mounted on andsurrounding said propeller shafts, and means for driving said additionalshafts and said sleeves from said motor comprising beveled gears mountedone on each of said propeller shafts, beveled gears alined with saidfirst mentioned beveled gears and mounted one on each of said propellersleeves, pinions meshing with both of said beveled gears, and gearingconnections between said motor shaft and said additional shafts, saidgearing comprisin a central gear on said motor shaft, slidab y mountedgears on said additional shafts, and means for sliding said additionalgears to throw the same out of action.

4. In a power boat in combination, a motor, a shaft for said motorprolonged to serve as a propeller shaft, a plurality of propeller shaftsin addition to the motor shaft, propeller driving sleeves mounted on andsurrounding said propeller shafts, and means for driving said additionalshafts and sleeves from said motor comprising beveled gears mounted oneon each of said propeller shafts, beveled gears alined with said firstmentioned beveled gears and mounted one on each of said propellersleeves, pinions meshing with both of said beveled gears, said beveledgearing comprising a fixed gear on said motor shaft, pinions meshingwith said fixed gear, and gears mounted on said additional shafts,meshing with said pinions, said pinions and said last mentioned gearsbeing shiftable axially and the gears on said additional shafts beingflanged so that the pinions are constrained to move therewith, and meansfor sliding said additional gears to throw said pinions out of mesh withthe gear on the mot-or shaft.

5. In a power boat in combination, a motor, a shaft for said motorprolonged to serve as a propeller shaft, a plurality of propeller shaftsin addition to the motor shaft, propeller driving sleeves mounted on andsurrounding said. propeller shafts, and means for driving saidadditional shafts and said sleeves from said motor comprising beveledgears mounted one on each of said propeller shafts. beveled gears alinedwith said first mentioned beveled gears and mounted one on each of saidpropeller sleeves. pinions meshing with both of said beveled gears, saidbeveled gearing comprising a fixed gear on said motor shaft, pinionsmeshing with said fixed gear, and gears mounted on said additionalshafts, meshing With said pinions, said pinions and said last mentionedgears being shiftable axially and the gears on said additional shaftsbeing flanged so that the pinions are constrained to move therewith, andmeans for sliding said additional gears to throw said pinions out ofmesh with the gear on the motor shaft, said means being arranged to move10 the gear on either additional shaft independently.

In testimony whereof I afliX my signature in the presence of twoWitnesses.

ANDREW WALLIS TUFFORD. l/Vitnesses:

D. S. TOVELL, H. M. CHRISTMAN.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Iatents.

Washington, D. C.

